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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 21 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> DTC P0685-P0687, P0689, P0690, or P1682 >> Component Testing

Component Testing

WARNING: This page is about a different variant/trim than selected.

Relay Test

  1. Ignition/Vehicle - Off
  2. Remove the component : KR75 Engine Controls Ignition Relay
  3. Test for 70 to 110 ohms between the test points : Component terminal 85 & 86
    • If not between 70 and 110 ohms 

      Replace the component : KR75 Engine Controls Ignition Relay

    • Go to next step : If between 70 and 110 ohms 
  4. Test for infinite resistance between the test points :
    • Component terminal 30 & 85
    • Component terminal 30 & 86
    • Component terminal 30 & 87
    • Component terminal 85 & 87
    • If less than infinite resistance 

      Replace the component : KR75 Engine Controls Ignition Relay

    • Go to next step : If infinite resistance 
  5. Connect a 3 A fused jumper wire between the test points : Component terminal 85 & B+

    Connect a jumper wire between the test points : Component terminal 86 & Ground

  6. Test for less than 2 ohms between the test points : Component terminal 30 & 87
    • If 2 ohms or greater 

      Replace the component : KR75 Engine Controls Ignition Relay

    • Go to next step : If less than 2 ohms 
  7. All OK.
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